Stop and have a drink (6)
I believe the answer is:
scotch
'stop' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for scotch that I've seen before include "Put paid to - whisky" , "Frustrate - whisky" , "Finish off" , "tot" , "Put an end to - whisky spelt thus?" .)